Integrated circuit for inverse discrete fourier transforming a frequency domain signal to a time domain symbol sequence

Patent metadata

Field	Value
Publication number	US-2018317229-A1
Application number	US-201816012519-A
Country	US
Kind code	A1
Filing date	Jun 19, 2018
Priority date	Sep 22, 2008
Publication date	Nov 1, 2018
Grant date	—

Abstract

A communication apparatus includes a receiver, a combiner, and a transformer. The receiver receives signals mapped on plural frequency bands. A size of at least one of the frequency bands is a multiple of a product of two or more powers of prime numbers, which are integer numbers greater than 1 and are different from each other. An exponent for at least one of the prime numbers is an integer greater than 1. The combiner combines the received signals into a combined signal. The transformer transforms the combined signal in a frequency domain into a symbol sequence in a time domain with an inverse discrete Fourier transform (IDFT) having a size that is a product of powers of plural values. The values are integer numbers greater than 1 and are different from each other. An exponent for at least one of the values is an integer greater than 1.

First claim

1 . A communication apparatus comprising:
a Discrete Fourier Transform (DFT) transformer which transforms a symbol in a time domain into a signal in a frequency domain with a DFT size that is a product of powers of a plurality of values, the plurality of values being integer numbers that are greater than 1 and are different from each other, exponents for the plurality of values being a set of non-negative integers; a mapper which maps the signal in the frequency domain on a plurality of frequency bands, each frequency band being located at a position separate from position(s) of other(s) of the plurality of frequency bands, wherein a vector length corresponding to a size of each of the plurality of frequency bands is a product of two or more powers of prime numbers or a multiple of the product of the two or more powers of prime numbers, each of the prime numbers being integer numbers that are greater than 1 and the prime numbers being different from each other, exponents for the prime numbers being a set of non-negative integers, and wherein the vector length is a number of subcarriers allocated to corresponding one of the plurality of frequency bands; and a signal generator which generates a single carrier-frequency division multiple access (SC-FDMA) signal in the time domain from the mapped signal.

2 . The communication apparatus according to claim 1 , wherein a number of the plurality of frequency bands is two, and a size of one of the two frequency bands is a multiple of a product of two or more powers of prime numbers.

3 . The communication apparatus according to claim 1 , wherein the prime numbers are selected in order from a smaller prime number.

4 . The communication apparatus according to claim 1 , wherein a size of all of the plurality of frequency bands is a multiple of a product of two or more powers of prime numbers.

5 . The communication apparatus according to claim 1 , wherein a first exponent for a first prime number is equal to or greater than a second exponent for a second prime number that is greater than the first prime number.

6 . The communication apparatus according to claim 1 , wherein a size of each of the plurality of frequency bands is one minimum division unit or multiple minimum division units, wherein the minimum division unit is a minimum number of subcarriers to form each of the plurality of frequency bands and is a product of two or more powers of prime numbers.

7 . The communication apparatus according to claim 6 , wherein a size of all of the plurality of frequency bands is a multiple of the minimum division unit.

8 . A communication method performed by a communication apparatus, comprising:
transforming a symbol in a time domain into a signal in a frequency domain with a discrete Fourier transform (DFT) having a size that is a product of powers of a plurality of values, the plurality of values being integer numbers that are greater than 1 and are different from each other, exponents for the plurality of values being a set of non-negative integers; mapping the signal in the frequency domain on a plurality of frequency bands, each frequency band being located at a position separate from position(s) of other(s) of the plurality of frequency bands, wherein a vector length corresponding to a size of each of the plurality of frequency bands is a product of two or more powers of prime numbers or a multiple of the product of the two or more powers of prime numbers, each of the prime numbers being integer numbers that are greater than 1 and the prime numbers being different from each other, exponents for the prime numbers being a set of non-negative integers, and wherein the vector length is a number of subcarriers allocated to corresponding one of the plurality of frequency bands; and generating a single carrier-frequency division multiple access (SC-FDMA) signal in the time domain from the mapped signal.

9 . The communication method according to claim 8 , a number of the plurality of frequency bands is two, and a size of one of the two frequency bands is a multiple of a product of two or more powers of prime numbers.

10 . The communication method according to claim 8 , wherein the prime numbers are selected in order from a smaller prime number.

11 . The communication method according to claim 8 , wherein a size of all of the plurality of frequency bands is a multiple of a product of two or more powers of prime numbers.

12 . The communication method according to claim 8 , wherein a first exponent for a first prime number is equal to or greater than a second exponent for a second prime number that is greater than the first prime number.

13 . The communication method according to claim 8 , wherein a size of each of the plurality of frequency bands is one minimum division unit or multiple minimum division units, and wherein the minimum division unit is a minimum number of subcarriers to form each of the plurality of frequency bands and is a product of two or more powers of prime numbers.

14 . The communication method according to claim 13 , wherein a size of all of the plurality of frequency bands is a multiple of the minimum division unit.

Assignees

• Sun Patent Trust

Inventors

• Takaoka Shinsuke
• Hoshino Masayuki
• Miyoshi Kenichi

Classifications

• H04W72/0453 Primary

  Resources in frequency domain, e.g. a carrier in FDMA · CPC title

• Y10S370/916

  Multiplexer/demultiplexer · CPC title

• H04J4/005

  Transmultiplexing · CPC title

• H04L27/26 Primary

  Systems using multi-frequency codes (H04L27/32 takes precedence) · CPC title

• H04L5/0041

  Frequency-non-contiguous · CPC title